标签: 温敏电阻

ThischaptercontainsgeneralinformationthatwillbeusefultoknowbeforeusingtheRTDReferenceDesign.Itemsdiscussedinthischapterinclude:•DocumentLayout•ConventionsUsedinthisGuide•RecommendedReading•TheMicrochipWebSite•CustomerSupport•DocumentRevisionHistoryResistiveTemperatureDetector(RTD)ReferenceDesign2010MicrochipTechnologyInc.DS51891ANotethefollowingdetailsofthecodeprotectionfeatureonMicrochipdevices:MicrochipproductsmeetthespecificationcontainedintheirparticularMicrochipDataSheet.Microchipbelievesthatitsfamilyofproductsisoneofthemostsecurefamiliesofitskindonthemarkettoday,whenusedintheintendedmannerandundernormalconditions.Therearedishonestandpossiblyillegalmethodsusedtobreachthecodeprotectionfeature.Allofthesemethods,toourknowledge,requireusingtheMicrochipproductsinamanneroutsidetheoperatingspecificationscontainedinMicrochip’sDataSheets.Mostlikely,thepersondoingsois……

INTRODUCTIONThereisavarietyoftemperaturesensorsonthemarketallofwhichmeetspecificapplicationneeds.Themostcommonsensorsthatareusedtosolvetheseapplica-tionproblemsincludethethermocouple,ResistiveTemperatureDetector(RTD)thermistor,andsili-con-basedsensors.Foranoverviewandcomparisonofthesesensors,refertoMicrochip’sAN679,“Temper-atureSensingTechnologies”.ThisapplicationnotefocusesoncircuitsolutionsthatuseNegativeTemperatureCoefficient(NTC)ther-mistorsinthedesign.TheThermistorhasanon-linearresistancechange-overtemperature.Thedegreeofthisnon-linearitywillbediscussedinthe“HardwareLinearizationSolutions”sectionofthisapplicationnote.Fromthisdiscussion,variouslinearizationresistornet-workswillbeshownwitherroranalysisincluded.Finally,thesignalconditioningpathforthethermistorsystemwillbecoveredwithcompleteapplicationcir-cuitsfromsensorormicroprocessor.AN685ThermistorsinSingleSupplyTemperatureSensingCircuitsgeneratedbythepowerdissipatedbytheelement.AnyAuthor:BonnieC.BakerchangeintheflowoftheliquidorgasacrossthedeviceMicrochipTechnologyInc.changesthepowerdissipationfactorofthethermistorelement.Inthismanner,theresistanceofthether-INTRODUCTIONmistorischanged,relat……

本应用笔记将讨论温度测量的两种设计，设计均使用精密的、负温度系数（NegativeTemperatureCoefficient，NTC）热敏电阻。热敏电阻放置在电阻型分压器中，以便线性化从温度至电压的转换。在转换到数字域进行处理之前，电压由MCP6SX2（MCP6S22或MCP6S92）可编程增益放大器（ProgrammableGainAmplifier，PGA）在模拟域进行处理。AN897使用MCP6SX2PGA的热敏电阻温度检测关键的的参数规格包括[1,2]：作者：KumenBlake和StevenBibleMicrochipTechnologyInc.+25°C的电阻：10k±1%B25/85容许误差：±0.75%简介工作温度范围：-40°C至+125°C（短时间内能到……